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Old 2017-02-13, 17:19   #1
marigonzes
 
Feb 2017

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Default Best CPU on the market

I was wondering what is the current best CPU on the market in terms of raw computing power (and the one that would be the best for prime95's type of workload). While searching, I came across the Xeon Phi processors family by Intel, which seem to be the most powerful I can find.

If someone could tell me about this, I would appreciate. Thanks
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Old 2017-02-13, 20:28   #2
VBCurtis
 
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In terms of raw computing power, GPUs win. Are you allowing a GPU to compete? Does your workload-of-interest run on a GPU?
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Old 2017-02-13, 20:42   #3
marigonzes
 
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I was just thinking of CPUs. But now that you mentioned, are there tasks that CPUs perform faster than GPUs in scientific/mathematics computation?
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Old 2017-02-13, 22:41   #4
xilman
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Quote:
Originally Posted by marigonzes View Post
I was just thinking of CPUs. But now that you mentioned, are there tasks that CPUs perform faster than GPUs in scientific/mathematics computation?
Almost certainly yes. Some tasks are intrinsically serial, and, AFAIK, some cpu cores are faster than individual processing elements in all GPUs. Listing some such tasks is left as a straightforward exercise in computer science.
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Old 2017-02-14, 00:06   #5
ATH
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If money is not a problem the fastest "consumer" CPU is probably the 10 core Broadwell-E Core i7-6950X at about $1700 for just the CPU.There are also cheaper Broadwell-E processors: 6900K, 6850K and 6800K.
https://en.wikipedia.org/wiki/Broadwell_(CPU)

In terms of single core speed it is probably the new
Kaby Lake Corei7-7700K with 4.2Ghz clock rate and 4.4-4.5 Ghz boost clock rate, but it "only" has 4 cores:
https://en.wikipedia.org/wiki/Kaby_Lake_(CPU)

There are of course even faster and even more expensive server Xeon processors probably of the Broadwell or Skylake generation, but I'm not sure which one is fastest.
https://en.wikipedia.org/wiki/Broadw...ver_processors
https://en.wikipedia.org/wiki/Skylak...ver_processors



The fastest "consumer" GPUs for single precision (trial factoring) is Geforce Titan X (Geforce 10 series, not the Titan X from Geforce 900 series back in 2015), and on 2nd place is Geforce GTX 1080:
https://en.wikipedia.org/wiki/GeForce_10_series

While for double precision (LL testing) the fastest "consumer" card is Geforce Titan Z (2 GPUs) from 2014 Geforce 700 series, followed by Geforce Titan Black and the original Geforce Titan from 2013:
https://en.wikipedia.org/wiki/GeForce_700_series



Now again if money is not an option the new Tesla GP100 PCI-E beats all the CPUs and GPUs I just listed in both single and double precision, but at $5,700 to $7,500 is should do that:
http://www.anandtech.com/show/10433/...ess-tesla-p100
See benchmarks from TheJudger here:
http://mersenneforum.org/showthread.php?t=12576

It is a "server" edition card without cooling, but it will come in a "workstation" edition in March called Nvidia Quadro GP100:
http://www.anandtech.com/show/11102/...s-quadro-gp100

No price listed but probably also >$5,000.

Last fiddled with by ATH on 2017-02-14 at 00:08
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Old 2017-02-14, 01:30   #6
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In addition to ATH's detailed response, there are other optimal selections if you are considering running multiple machines.
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Old 2017-02-14, 05:03   #7
Madpoo
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Quote:
Originally Posted by ATH View Post
There are of course even faster and even more expensive server Xeon processors probably of the Broadwell or Skylake generation, but I'm not sure which one is fastest.
https://en.wikipedia.org/wiki/Broadw...ver_processors
https://en.wikipedia.org/wiki/Skylak...ver_processors
Unless I missed something (possible), the Xeon Skylake's out there are just the E3 models that have been showing up in higher end laptops, single socket. The E5/E7 Skylakes aren't out (dual+ socket) and those are the ones that'll have the AVX-512 stuff.

In terms of core count, the Xeon Broadwells are the top of the line, with as many as 22-cores on a single chip. You can get an E5-46xx v4 quad-socket system, if you have VERY deep pockets (each of those quad-socket models at 22-core count has an MSRP of $7K each).

If you could "settle" for a dual socket system you can get the E5-2699 v4 for a mere $4K or so.

There are some folks here who have used those 22-core beasts to generate some benchmarks. My top-end systems are dual 14-core which fit our budget, and yeah, it's not 22-core but they're still awesome.

High core counts are great for threaded applications, but if the application is really just a single-threaded type of thing, then yeah, get a desktop type chip with fewer cores but a high GHz (like that Kaby Lake you said).

(sorry ATH, I know my reply is to your post but I'm really addressing the original poster...I'm sure you knew that)
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Old 2017-02-14, 17:04   #8
marigonzes
 
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Thank you all for your answers. I will take a look at the CPUs/GPUs you mentioned in your replies and see what fits my budget and needs. I will most certainly contribute to your wonderful project when I can.

Thanks again.
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Old 2017-02-14, 17:05   #9
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Quote:
Originally Posted by Madpoo View Post
In terms of core count, the Xeon Broadwells are the top of the line, with as many as 22-cores on a single chip. You can get an E5-46xx v4 quad-socket system, if you have VERY deep pockets (each of those quad-socket models at 22-core count has an MSRP of $7K each).
To be correct: the Broadwell top of the line has 24 cores. E7-8890 v4 and E7-8894 v4. They are exactly the same die as used for those upper end E5-26xx v4 CPUs.

Oliver
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Old 2017-02-14, 22:40   #10
bgbeuning
 
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Quote:
Originally Posted by marigonzes View Post
I was wondering what is the current best CPU on the market in terms of raw computing power (and the one that would be the best for prime95's type of workload). While searching, I came across the Xeon Phi processors family by Intel, which seem to be the most powerful I can find.

If someone could tell me about this, I would appreciate. Thanks
Best is a very subjective word.

prime95 does not use hyper-threading. The i5 CPU does not have hyper-threading,
so why pay for an i7 or Xeon with hyper-threading when prime95 will not use it?

prime95 is very memory intensive. 4 cores seem to max out 2 memory channels.
Why buy more cores if they will be starved for data from memory?

prime95 will not currently use a Xeon Phi nor a GPU, but I expect this to change
in the not distant future.

After a couple of years of running prime95, you will have spent as much on electricity
as your system cost. So minimizing the power consumption in some sense is better.
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Old 2017-02-15, 00:16   #11
henryzz
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Quote:
Originally Posted by bgbeuning View Post
Best is a very subjective word.

prime95 does not use hyper-threading. The i5 CPU does not have hyper-threading,
so why pay for an i7 or Xeon with hyper-threading when prime95 will not use it?

prime95 is very memory intensive. 4 cores seem to max out 2 memory channels.
Why buy more cores if they will be starved for data from memory?

prime95 will not currently use a Xeon Phi nor a GPU, but I expect this to change
in the not distant future.

After a couple of years of running prime95, you will have spent as much on electricity
as your system cost. So minimizing the power consumption in some sense is better.
One suggestion is a Broadwell-E system with 6 cores and fast 4-channel memory. Memory bandwidth and the cpu should be fairly even then with fast enough dimms. This system would probably cost more than 2 i5 quad systems for similar performance.
Price wise before kaby lake came out people were buying lots of 6500 systems with cheap motherboards and memory. The builds are http://mersenneforum.org/showthread.php?t=20795&page=3
I believe that the Xeon Phi is a strong competitor. I would need to look at benchmarks again to confirm how good it is.

Last fiddled with by henryzz on 2017-02-15 at 00:17
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